Extend SDL2 Renderer and SDL2-video-demo

Implements CLAY_RENDER_COMMAND_TYPE_IMAGE and
CLAY_RENDER_COMMAND_TYPE_BORDER for SDL2.

Both have been added to SDL-video-demo to provide examples.

examples/SDL2-video-demo/CMakeLists.txt

@@ -23,6 +23,15 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(SDL2_ttf)
 
+FetchContent_Declare(
+    SDL2_image
+    GIT_REPOSITORY "https://github.com/libsdl-org/SDL_image.git"
+    GIT_TAG "release-2.8.4"
+    GIT_PROGRESS TRUE
+    GIT_SHALLOW TRUE
+)
+FetchContent_MakeAvailable(SDL2_image)
+
 add_executable(SDL2_video_demo main.c)
 
 target_compile_options(SDL2_video_demo PUBLIC)
@@ -32,6 +41,7 @@ target_link_libraries(SDL2_video_demo PUBLIC
     SDL2::SDL2main
     SDL2::SDL2-static
     SDL2_ttf::SDL2_ttf-static
+    SDL2_image::SDL2_image-static
 )
 
 if(MSVC)

examples/SDL2-video-demo/main.c

@@ -13,6 +13,8 @@
 const int FONT_ID_BODY_16 = 0;
 Clay_Color COLOR_WHITE = { 255, 255, 255, 255};
 
+SDL_Surface *sample_image;
+
 void RenderHeaderButton(Clay_String text) {
     CLAY(
         CLAY_LAYOUT({ .padding = { 16, 16, 8, 8 }}),
@@ -111,9 +113,18 @@ static Clay_RenderCommandArray CreateLayout() {
             })
         ) {
             // Header buttons go here
+            CLAY(
+                CLAY_LAYOUT({ .padding = { 16, 16, 8, 8 }}),
+                CLAY_BORDER_ALL({ 2, COLOR_WHITE })
+            ) {
+                CLAY(
+                    CLAY_LAYOUT({ .padding = { 8, 8, 8, 8 }}),
+                    CLAY_IMAGE({ sample_image, { 23, 42 } })
+                ) {}
+            }
             CLAY(
                 CLAY_ID("FileButton"),
-                CLAY_LAYOUT({ .padding = { 16, 8 }}),
+                CLAY_LAYOUT({ .padding = { 16, 16, 8, 8 }}),
                 CLAY_RECTANGLE({
                     .color = { 140, 140, 140, 255 },
                     .cornerRadius = 5
@@ -278,6 +289,10 @@ int main(int argc, char *argv[]) {
         fprintf(stderr, "Error: could not initialize TTF: %s\n", TTF_GetError());
         return 1;
     }
+    if (IMG_Init(IMG_INIT_PNG) < 0) {
+        fprintf(stderr, "Error: could not initialize IMG: %s\n", IMG_GetError());
+        return 1;
+    }
 
     TTF_Font *font = TTF_OpenFont("resources/Roboto-Regular.ttf", 16);
     if (!font) {
@@ -289,6 +304,8 @@ int main(int argc, char *argv[]) {
         .font = font,
     };
 
+    sample_image = IMG_Load("resources/sample.png");
+
     SDL_Window *window = NULL;
     SDL_Renderer *renderer = NULL;
     if (SDL_CreateWindowAndRenderer(800, 600, SDL_WINDOW_RESIZABLE, &window, &renderer) < 0) {
@@ -352,6 +369,7 @@ int main(int argc, char *argv[]) {
 quit:
     SDL_DestroyRenderer(renderer);
     SDL_DestroyWindow(window);
+    IMG_Quit();
     TTF_Quit();
     SDL_Quit();
     return 0;

renderers/SDL2/README

@@ -1,7 +1,5 @@
 Please note, the SDL2 renderer is not 100% feature complete. It is currently missing:
 
-- Border rendering
-- Image rendering
 - Rounded rectangle corners
 
 Note: on Mac OSX, SDL2 for some reason decides to automatically disable momentum scrolling on macbook trackpads.
@@ -10,4 +8,4 @@ You can re enable it in objective C using:
 ```C
 [[NSUserDefaults standardUserDefaults] setBool: YES
                                        forKey: @"AppleMomentumScrollSupported"];
-```
+```

renderers/SDL2/clay_renderer_SDL2.c

@@ -1,8 +1,11 @@
 #include "../../clay.h"
 #include <SDL.h>
 #include <SDL_ttf.h>
+#include <SDL_image.h>
 #include <stdio.h>
 
+#define CLAY_COLOR_TO_SDL_COLOR_ARGS(color) color.r, color.g, color.b, color.a
+
 typedef struct
 {
     uint32_t fontId;
@@ -93,10 +96,55 @@ static void Clay_SDL2_Render(SDL_Renderer *renderer, Clay_RenderCommandArray ren
                 SDL_RenderSetClipRect(renderer, NULL);
                 break;
             }
+            case CLAY_RENDER_COMMAND_TYPE_IMAGE: {
+                SDL_Surface *image = (SDL_Surface *)renderCommand->config.imageElementConfig->imageData;
+
+                SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, image);
+
+                SDL_Rect destination = (SDL_Rect){
+                    .x = boundingBox.x,
+                    .y = boundingBox.y,
+                    .w = boundingBox.width,
+                    .h = boundingBox.height,
+                };
+
+                SDL_RenderCopy(renderer, texture, NULL, &destination);
+                break;
+            }
+            case CLAY_RENDER_COMMAND_TYPE_BORDER: {
+                Clay_BorderElementConfig *config = renderCommand->config.borderElementConfig;
+
+                if (config->left.width > 0) {
+                    SDL_SetRenderDrawColor(renderer, CLAY_COLOR_TO_SDL_COLOR_ARGS(config->left.color));
+                    SDL_RenderFillRectF(renderer, &(SDL_FRect){ boundingBox.x, boundingBox.y + config->cornerRadius.topLeft, config->left.width, boundingBox.height - config->cornerRadius.topLeft - config->cornerRadius.bottomLeft });
+                }
+
+                if (config->right.width > 0) {
+                    SDL_SetRenderDrawColor(renderer, CLAY_COLOR_TO_SDL_COLOR_ARGS(config->right.color));
+                    SDL_RenderFillRectF(renderer, &(SDL_FRect){ boundingBox.x + boundingBox.width - config->right.width, boundingBox.y + config->cornerRadius.topRight, config->right.width, boundingBox.height - config->cornerRadius.topRight - config->cornerRadius.bottomRight });
+                }
+
+                if (config->right.width > 0) {
+                    SDL_SetRenderDrawColor(renderer, CLAY_COLOR_TO_SDL_COLOR_ARGS(config->right.color));
+                    SDL_RenderFillRectF(renderer, &(SDL_FRect){ boundingBox.x + boundingBox.width - config->right.width, boundingBox.y + config->cornerRadius.topRight, config->right.width, boundingBox.height - config->cornerRadius.topRight - config->cornerRadius.bottomRight });
+                }
+
+                if (config->top.width > 0) {
+                    SDL_SetRenderDrawColor(renderer, CLAY_COLOR_TO_SDL_COLOR_ARGS(config->right.color));
+                    SDL_RenderFillRectF(renderer, &(SDL_FRect){ boundingBox.x + config->cornerRadius.topLeft, boundingBox.y, boundingBox.width - config->cornerRadius.topLeft - config->cornerRadius.topRight, config->top.width });
+                }
+
+                if (config->bottom.width > 0) {
+                    SDL_SetRenderDrawColor(renderer, CLAY_COLOR_TO_SDL_COLOR_ARGS(config->bottom.color));
+                    SDL_RenderFillRectF(renderer, &(SDL_FRect){ boundingBox.x + config->cornerRadius.bottomLeft, boundingBox.y + boundingBox.height - config->bottom.width, boundingBox.width - config->cornerRadius.bottomLeft - config->cornerRadius.bottomRight, config->bottom.width });
+                }
+
+                break;
+            }
             default: {
                 fprintf(stderr, "Error: unhandled render command: %d\n", renderCommand->commandType);
                 exit(1);
             }
         }
     }
-}
+}